Spark timing control for marine propulsion devices

Abstract From the Canadian patent

A marine propulsion device comprising a mounting assembly adapted to be mounted on the transom of a boat, and a propulsion unit mounted on the mounting assembly for pivotal movement relative thereto about a generally vertical steering axis the, propulsion unit including a rotatably mounted propeller, and an internal combustion engine drivingly connected to the propeller, the engine comprising an engine block, a timing member mounted on the engine block for movement relative thereto in opposite advance and retarding the spark timing of the engine, a releasable lock for preventing movement of the timing member in the retard direction and an, operator actuatable mechanism for releasing the …